Rust-removing composition for metals



' citizen of the United States, residing at Elkins Park, in the countyof Montgomery Y and State of Pennsylvania, have invented Patented Aug.11,1925.

umrno STATES PATENT OFFICE.

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To all whom it may concern. Be it known that 1, JAMES H.:GRAVELL, a-

a new and useful Improvement in Rust-Removing Compositions forMetals,-of which the following is a specification.

This invention relates to rust removing and preventing compoundsgenerally, and especially to those compounds which are used forpreparing metal for painting.

{One object of the invention is to provide a compound that willefficiently remove rust and will neutralize or destroy those agencies 'Wwhich cause rust, such as hand marks, acid runs and soldering solutions;Another object of the invention is to provide a material which willremain wet or liquid after being placed on the surface; to becle'anedfor sufiicient time for enabling it to complete its work. I y v e I Itis now well known that acids are very satisfactory for removing rustand. that phosphoric acid, owing to the easeof securing it commercially,is especially useful for that purpose.

To use these acids for cleaning metal, they are diluted with a solventto the. proper strength and are applied directly to the surface to. becleaned .by dipping, spraying or brushing.

In practice it is found thatthe solvent evaporates or that the compounddries long before the chemical activity of the acid is exhausted withthe result that'all cleaning action stops and repeated applications ofthe diluted: acid must be resorted to in order to properly clean thesurface.

i I have discoveredthat the addition of sodium in'proper quantities tothe acid-sold.

tion causes it. to remain'li uid or wet for a substantially longer perisothatasingle application of the acid solution is m many cases all thatis required.

In order make my cleaner I may use :1 7

, 85% phosphoric acid 1 Metallic sodiume 4 This may betermed mypreparedacid.

Application filed; May 9,

192 semi no. 559,598.

To inake upacleaning solution I may use:

Gallona' Prepared acid; 21 Water '55 This solution works verysatisfactorily on work that is free from oil, but is not eflec t1vewhere oil-is present. In order to make the material eifective on'an oilysurface I add an ingredient adapted to lower the sur-v so face tensionof the compound, such as alcohol, acetone or ethyl acetate, as follows:

. e Gallons.

Prepared acid 21 ater I Alcohol, ethyl or itsequivalent 19 The oilremoving properties. of the com-' pound may be further improved by theaddition of fusel oil or any of the components of fusel oil, such asbutyl alcohol, as follows:

' Gallons. Prepared acid i 21 Water e i 55 Alcohol, ethyl or itsequivalent- 19 Butyl alcohol 5 salt are insoluble in water and the termsodium includes any metal which dissolved in the acid will not-beprecipitated by the addition of alcohol and which has the propertyofkeeping. the composition liquid orwet. d

It'is within thesco e of the invention to produce my prepare acid bytheaction of. an acid on material containin sodiumso that the sodiumphosphate e automatically producedin association with the metal etchingacid, in other fwords,;sodium content m of the finished prepared acidmay be taken care of in the manufacturing of the mono-sodium phosphate,substantially as clehasic achl. scribed.

ll claim: p 3. A cleaning agent for metals comprising 1, A cleaningagent for metals comprising free phosphoric acid, water, ethyl alcohol,

s free phosphoric acid, water and mono-sobutylalcohol and mono-sodiumphosphate,

diam phosphate, substantially as described. substantially as described.a

2. A cleaning agent for metals comprising free phosphoric acid, water,alcohol an JAMES'H. GRAVELL.

